File: dependency_injection_simple.py

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from litestar import Litestar, websocket_listener
from litestar.di import Provide


def some_dependency() -> str:
    return "hello"


@websocket_listener("/", dependencies={"some": Provide(some_dependency)})
async def handler(data: str, some: str) -> str:
    return data + some


app = Litestar([handler])